<p>Please take this, not as criticism, but advice that save you money, save you aggrevation and get the best photos in the long run.<br>
1) Getting permission to shoot on a college football field is much harder to get that you might imagine - call the AD at your son't college as ask him. If he's going to a major college football program - forget it'<br>
2) College football is more intense and moves at a much faster pace than high school ball - both on the field of play and the area around it. Not a place for a novice.<br>
3) There will be other photographer's around the field taking photos (for pay) for the local newspaper, the campus paper, etc -- the bigger the school the more photographers.<br>
4) If you want good photos of your son I suggest you talk to someone in the Athletic Dept and see who shoots for the school or if he has contact on the local paper and then I'd approach one or both and tell them you son't son's number and position and ask them what they'd charge to get some good photos - it will be less expensive that any of the lens that would work for you and you can sit in the stands and enjoy the game.<br>
I've shot my grand-daughter's soccer games since she was 5 to the present when she play's on both a ECNL soccer team and her high school team and she will be heading to college next year of a scholarship (soccer and academics) and very few of her team mates parents bring camera's to the game anymore after they my results - I don't do it for a living but I do pay for all my gear plus traveling expenses and a team party once in awhile.</p>